 Measurement of the fiber orientation and areal  
weight along with defect detection in a carbon fiber composite are  
crucial in understanding the load carrying capability of the  
structure.  Manufacturing conditions including resin flow and molding  
pressures can alter fiber orientation, and hand or robotic fiber layup  
processes can be difficult to certify. Verification of the as-designed  
fiber layup thus becomes necessary to ensure optimal performance of  
the structure.  In this work, the application of eddy current  
techniques for analysis of carbon fiber composites is presented.  A  
proposed transmit-receive eddy current probe is modeled and its  
response to an anisotropic multi-layer conductor simulated and  
compared to experimental data.  The inductively coupled single sided  
measurement enables composite characterization through the thickness  
of the part.  The capabilities of eddy current analysis for advanced  
composites will be shown, and an inversion algorithm to enable  
determination of layup and impact damage across a composite structure  
will be presented.  The fast and cost-effective technique can be  
applied as a spot check or as a surface map of the composite  
properties across the structure.  In particular, we demonstrate the power of voxel-based inverse methods using the set-theoretic inversion algorithm to obtain excellent responses.  In voxel-based invese methods, we reconstruct the entirely anomaly voxel-by-voxel without recourse to an underlying canonical model.  In test problems using set-theoretic algorithm we have solved inverse problems for multilayered composite structures with several thousand unknowns in fifteen seconds.  We will present several examples of the method to solve inverse problems for microstructure characterization of multilayer composites.


Electromagnetic Modeling and Inverse Methods for Eddy-Current Characterization of Carbon Fiber Composites

No proceedings papers in 2020. Video only.

QNDE2020 - Virtual Conference

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